Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67d6cfb9ae9fcb1…

MALICIOUS

PDF

78.7 KB Created: 2021-08-12 02:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1879645efa56fdc6d29adb6fedcbbf22 SHA-1: 2fa6ec764af36c92563c274357ee76e84f444d43 SHA-256: a67d6cfb9ae9fcb1e07300323f5e3c0fa54e405b139c62fa5403f4bfd4e33516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Several heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content. Although no scripts were extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lamaisonducoeur.ca/upload/editor/file/jodevajotakiguxozuji.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083363169758---pavotalamesi.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/64911402067.pdfIn PDF document text
    • https://limmaginebistrot.com/file/25094504102.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5dc86545f---pajezututovewavavidim.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/059830b553f32c67387ae57ddb323482/10492610282.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/36848996027.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/35973514410.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/50993ddb7f0f93568ab56d9007f69023/15908988673.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be45e960451916737bd9ac7be595b190/madejidavifeluzesomuwam.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/pomabamoditino.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/kirosuve.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/13337523615.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/19499664093.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/27268148282.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/98774938662.pdfIn PDF document text
    • http://short-story.ru/upload/file/14104857780.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/linurum.pdfIn PDF document text
    • https://lavineriablend.it/file/53609822476.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27c697ec9---13298434047.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f53b7ac4e---18341215239.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945d6f088cf---965593883.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7781ccbebc---5808967868.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/86332620765.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/esj8c2kqh41n59bumsngs190n1/5096684293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+pe+car+mod+download+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 16856 bytes
SHA-256: 8accf81ba3365594319b6ec72b52f6f8faf36a44e635f9c25153c6318557852d
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 10692 bytes
SHA-256: ce87f87a7a6b8480713656cba00fdff99a64e35bb5f9cdcab9510c89c930e2cd
font_02_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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